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Lecture 5 : D istance M easuring E quipment ( DME )

Lecture 5 : D istance M easuring E quipment ( DME ). Definition. DME is stand for D istance M easuring E quipment. DME is a type of en-route navigation system for aircraft. DME often installed near VOR stations so as to provide combined bearing and distance .

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Lecture 5 : D istance M easuring E quipment ( DME )

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  1. Lecture 5: DistanceMeasuring Equipment (DME)

  2. Definition • DME is stand for Distance Measuring Equipment. • DME is a type of en-route navigation system for aircraft. • DME often installed near VOR stations so as to provide combined bearing and distance. • When DME is installed with the VOR, it is referred to as a VOR/DME.

  3. The uses of DME • DME provides the physical distance from the aircraft to the ground DME antenna expressed in Nautical Miles (NM). • DME also calculates ground speed and the time needed to reach the station if the aircraft is fitted with appropriate computer.

  4. DME indicator in the cockpit DME antenna on the aircraft body Ground DME Antenna

  5. DME System Components: The DME system consists of three basic components which are: • DME antenna on the aircraft body • DME indicator in the cockpit • Ground DME Antenna

  6. DME INDICATOR IN THE COCKPIT

  7. DME Indicator • DME enables aircraft to establish its range to the ground station: Distance in nautical miles, Ground speed in knots, Flying time to the station in minutes

  8. DME PRINCIPLE

  9. How DME works? • Aircraft’s DME antenna sent out signal to ground DME antenna. • Ground DME antenna receives and respond back the signal. • The system operates in the ultra-high frequency (UHF). • DME receiver inside the cockpit then measures the distance from the aircraft to the ground DME antenna. • Then, the computed distance is displayed through DME indicator in the cockpit.

  10. How DME works? • The distance formula is also used by the DME receiver to calculate the distance from DME station in Nautical Miles. • Distance formula=theorem Pythagoras

  11. Advantages of DME • DME is extremely accurate: Provide continuous and accurate indication of the slant range distance. • Aircraft Handling Capability: The transponder equipment should be capable of handling 100 to 200 aircrafts. • Large coverage: DME facility provides coverage up to 200 NM.

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